牛皮癣

例句：

1. 1. The patient's skin condition is a form of psoriasis.
   患者的皮肤状况是一种银屑病。
2. 2. Psoriasis is a chronic autoimmune disease that affects the skin.
   银屑病是一种慢性自身免疫性疾病，影响皮肤。
3. 3. The doctor prescribed him some topical cream to treat his psoriasis.
   医生给他开了一些外用药膏来治疗他的银屑病。